Support for a high fidelity stereophonic system



J.MAGYAR ET AL.

SUPPORT FOR A HIGH FIDELITY STEREOPHONIC SYSTEM I Filed July 2:, 1964May 28, 1968 v 3 sheets-sheet 1 INVENTORS J 01/ "#6)?! lP/MMD flaw/WW M644% orumvnq May 28, 1968 J. MAGYAR ET AL 3,385,929

SUPPORT FOR A HIGH FIDELITY STEREOPHONIC SYSTEM 3 Sheets-Sheet 2 FiledJuly 23, 1964 f A J! I mum FIO.9.

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May 28, 1968 J. MAGYAR ET AL 3,385,929

. SUPPORT FOR A HIGH FIDELIT; STEREOPHONIC SYSTEM Filed July 23 1964 I 3Sheets-Sheet o United States Patent 3,385,929 SUPPORT FOR A HIGHFIDELITY STEREOPHONIC SYSTEM John Magyar and Richard Houghton Spencer,Toronto,

Ontario, Canada, assignors to Clairtone Sound Corporation Limited,Rexdale, Ontario, Canada Filed July 23, 1964, Ser. No. 384,607 11Claims. (Cl. 179-1) ABSTRACT OF THE DISCLOSURE A high fidelitystereophonic system including a turntable, a pair of speakers and acommon support for these components including a column which supportsthe turntable and also an elongated boom, the speakers being mounted, inpractice, on opposite ends of this boom such that vibrations from thespeakers are effectively dissipated during travel along the boom toprevent feedback to the turntable unit.

The present invention relates generally to an improved high fidelitystereophonic system, the improvements broadly being concerned with acommon support physically integrating the various components of saidsystem, and more specifically with selective regulation of thedirectional sound radiation of the system to promote an optimumstereophonic effect.

The usual basic components of a high fidelity stereophonic systeminclude a turntable and associated turntable components and a pair ofloudspeakers, said components in a usual custom installation beingseparately housed in individual enclosures which only in rare instancesare physically integrated on a common support. By spacially isolatingthe system components, and more particularly, the low frequency soundloudspeaker from the turntable, the problem of vibration feedbacktherebetween is obviated. However, but for the vibration feedbackproblem it unquestionably would be more commercially preferable to havethe system components integrated on a common support.

Accordingly, it is broadly an object of the present invention to providea common support for the individual enclosures of the component parts ofa high fidelity stereophonic system which achieves physical integrationof said system and which also maintains a spacial relationship betweensaid enclosures to a degree which is effective to prevent thetransmission of vibration therebetween which adversely affects soundreproduction of the system.

More specifically, it is an object to provide a common support for saidvarious component enclosures which, on the one hand, permits arelatively compact spacial arrangement of said enclosures, and on theother hand offers a sufficiently long path through which vibration canbe transmitted therebetween to substantially dissipate much of thesystem vibration.

The present invention is moreover concerned with closely matching theacoustical characteristics of the listening environment to the knowncharacteristics of the recording environment to correspondingly promotea closer match between the reproduced sound and the original sound.Thus, for example, a musical piece recorded in a cathedral and underusual conditions therein where the performers are hidden and theaudience hears only reflected sound waves, is recognized according tothe present invention as requiring playback in the listening environmentin a manner which duplicates this total indirect transmission of thesound to the listener. Similarly, a musical piece recorded in otherenvironments, as for example in a nightclub, might require playbackwhich transmits the reproduced sound both directly and indirectly to thelistener to more closely match the sound "Ice transmission of theoriginal recording and listening environments.

Thus, it is a further object of the present invention to provide in acommon support for a high fidelity stereophonic system means formounting the loudspeaker and enclosure assemblies thereon which permitsselective adjustment in the directional sound radiation of saidloudspeakers to achieve any desired degree of direct and indirect soundtransmission.

A common support according to the present invention includes anupstanding hollow column having opposite vertical slots in its upper endaccommodating the medial portion of a laterally extending boom. Amounting plate accommodating a turntable enclosure is provided with acylindrical collar which is slidably disposed in the upper end openingof the column and seats against the boom to secure the same againstmovement under the weight of the turntable. The loudspeaker enclosuresare mounted on the remote ends of the boom in spaced relation from andon opposite sides of the turntable enclosure supported on the column.More particularly, the arrangement of said enclosures on the boom is, onthe one hand, compact in that the enclosures at their closest point arenot far removed from each other, while on the other hand, the paththrough which vibration can be transmitted therebetween as determined bythe points of connection of said enclosures to said boom is suflicientlylong to substantially dissipate much of the vibration of theloudspeakers of the system.

Additionally included within the scope of the present invention areseveral embodiments of rotatable mountings for the loudspeakerenclosures which permit selective adjustment in the directional soundradiation of the loudspeakers of the system to regulate, as desired, themanner in which the reproduced sound is transmitted to the listener,that is whether directly or indirectly by reflection from surfaces ofthe listening environment.

The above brief description, as well as further objects, features andadvantages of the present invention will be more fully appreciated byreference to the following detailed description of presently preferred,but nonetheless illustrative embodiments in accordance with the presentinvention, when taken in conjunction with the accompanying drawings,wherein:

FIG. 1 is a front elevational view of an assembly of a high fidelitystereophonic system and a common support therefor embodying features ofthe present invention;

FIG. 2 is a side elevational view of the assembly of FIG. 1;

FIG. 3 is a plan view of the assembly of FIG. 1, as seen from a vantagepoint beneath the assembly;

FIG. 4 is a partial side sectional view, taken along lines 4-4 of FIG.1, illustrating on an enlarged scale the mounting of the boom andturntable enclosure support plate on an upstanding column of thesupport;

FIG. 5 is a partial front sectional view, taken along lines 55 of FIG.4, further illustrating the mounting connection shown in FIG. 4, andadditionally the manner in which the electrical wiring is disposedthrough such connection;

FIG. 6 is an exploded view of FIG. 4 more clearly illustrating the orderof assembly of the parts making such connection;

FIG. 7 is an exploded view of FIG. 5, with the electrical wiringremoved, and particularly illustrating notches on the boom for seatingthe same on the column;

FIG. 8 is a detailed isolated view, on an enlarged scale, of aloudspeaker and enclosure assembly with portions of the enclosure brokenaway to illustrate one embodiment of a loudspeaker mounting;

FIG. 9 is a still further enlarged detailed view of the assembly of FIG.8, with portions thereof in section to illustrate one embodiment of arotatable boom mounting for said loudspeaker and enclosure assembly;

FIG. 10 is a view similar to FIG. 8 but of another embodiment of aloudspeaker mounting;

FIG. 11 is a plan view, in reduced scale, projected from FIG. 10 as seenfrom a vantage point beneath the assembly of FIG. 10;

FIG. 12 is an elevational sectional view, taken along lines 1212 of FIG.11, of another embodiment of a rotatable boom mounting for a loudspeakerand enclosure assembly; and

FIG. 13 is a plan sectional view, taken on lines 1313 of FIG. 12,illustrating the cooperating stop pins of such rotatable mounting whichlimits rotation of said mounting to one 360 degree traverse.

Shown in FIG. 1 is a preferred embodiment of a common support, generallydesignated 10, for the several component enclosures 12, 14 of a highfidelity stereophonic system. The relatively large generally rectangularenclosure 12 will be understood in practice to house not only theturntable of the system, but also the amplifier and other such componentparts of the system, but for simplicitys sake will herein be consideredas principally an enclosure for the turntable (not shown) of the system.The generally spherical enclosures 14 each house a loudspeaker of thesystem. As shown in FIG. 1, the enclosures 12, 14 are relativelycompactly arranged on the support 10, each of the loudspeaker enclosures14 being spaced at their closest point only a comparatively smalldistance D from the opposite ends of the turntable enclosure 12.However, while achieving this desirable compact spacial arrangement, itwill be noted that the path through which vibration of a loudspeakercould be transmitted to the turntable of the system, taking for examplethe left hand loudspeaker enclosure 14 relative to the turntableenclosure 12, is determined by the respective points of contact A and Bof these enclosures with the common support 10 and thus is several timesthe distance D. Accordingly, the common support 10 of the presentinvention which permits, on the one hand, such a compact spacialarrangement of the enclosures 12, 14 while, on the other hand,maintaining a comparatively long vibration path between said enclosuresrepresents an optimum solution to obviating vibrational feedback betweenthe component parts of the system consistent with an economy of space.

As shown in FIG. 1, the common support 10 includes a hollow cylindricalcolumn 16 supported in a vertical upright position on a wide leg base 18suitably connected to the base of the column. As is best shown in FIGS.4-7, the upper end 20 of the column is provided with opposite verticalslots 22 for accommodating an elongated horizontally disposed boom 24(see FIGS. 1, 2) and also cylindrical extending collar 26 Welded to theunderside of a mounting plate 28 for the turntable enclosure 12. Inorder of assembly, the medial portion 30 of the boom 24 is firstslidably disposed in the slots 22 such that spaced notches 32 providedon the underside of said boom engage the bottom surfaces 34 of the saidslots for generally seating the boom 24 within the column 10. Followingthis, the mounting plate collar 26 is slidably disposed in the endopening 36 of the column 10 and seats against the upper surface 38 ofthe boom, this sliding connection between the collar 26 and column 10being secured against rotation by the engagement of the upper end ofeach slot 22 with spaced blocks 40 welded to the outer periphery of thecollar 26. To further prevent rotation of the collar 26 within thecolumn 10 and also to interconnect the collar 26 and boom 24, the lengthprovided the collar is such as to project the lower collar end 42 beyondthe upper boom surface 38 and such projecting collar end is providedwith seating slots 44 engaging this surface portion of the boom.Moreover, not only is it provided that the collar 26 seat against theboom 24 as just described, but also that the supported weight of theturntable and other components (not shown) which in practice are housedin the enclosure 12 and mounted on the plate 28 bear against the boom 24to securely hold this support member in its mounted position on theupright column 10. This is achieved by providing the upper portion 46 ofthe mounting plate collar 28 from the seating slots 44 to the connectionof the mounting plate 28 thereon with sufiicient length to clear theupper end of the column 10 when said collar is telescoped in saidcolumn, such clearance being exaggerated in FIG. 4 and designated C. Dueto the Weight of the enclosure 12 bearing against and firmly holding theboom 24 at its medial portion 30 in position within the column 10, thereis no problem in providing sufficient length to the boom 24 so that theoverhang of this member on either side of the column 10 is adequate toproject the opposite ends 48 of said boom sufiiciently beyond the endsof the enclosure 12 to accommodate the loudspeaker enclosures 14thereon. Moreover, since the enclosure 12 as best shown in FIG. 1 ismounted with considerable overhang on the mounting plate 28, a pair ofspaced brackets 50 are bolted on the underside of said enclosure, asshown in FIG. 3, and are seated on the boom overhang to stabilize themounted position of the enclosure 12 on the support 10.

Returning to FIG. 5, it will be seen that the loudspeaker electricalwiring 52 is directed from the components housed in the enclosure 12(not shown in FIG. 5) through aligned openings 54 and 56 in the mountingplate and boom 28, 24 respectively, to a channel 58 machined in theunderside of the boom 24, and as best shown in FIG. 3, is then directedto each of the loudspeaker enclosures 14 for connection to saidloudspeakers as is hereinafter described.

In accordance with the present invention, the loudspeaker enclosures 14are each mounted on a boom end 48, the mounting connection therebetweenbeing such as to permit rotation of said enclosures 14 for selectiveadjustment of the directional sound radiation of the system for thepurpose of matching the sound transmission in the listening environmentto the known sound transmission of the original recording environment.Thus, where it is known that the musical piece is recorded in forexample a cathedral and under usual conditions where the performers arehidden and the audience hears only reflected sound waves, theloudspeaker enclosures 14 are correspondingly orientated in theirrotatable mountings to transmit the sound by reflection from surfaceswithin the listening environment to duplicate this total indirecttransmission of the sound to the listener.

One preferred embodiment of a rotatable mounting for each of theloudspeaker enclosures is shown in FIGS. 8 and 9 and generallydesignated 60. Mounting 60 includes a spindle 62 provided with amachined slot 64 which slidably receives the boom end 48. After beingthusly fitted on the boom end 48, the spindle 62 is physically joined tosaid boom by a bolt 66 which is conveniently extended from the undersideof and through the body of the boom in the working clearance C of thechannel 58 into the body portion of said spindle 62 which extendsinwardly of the end of the boom 24. Disposed in a vertical centralthrough bore 68 provided in the body of the spindle 62 is a hollowthreaded stud 70 which interconnects the loudspeaker enclosure 14 andthe spindle 62 and also serves as a vertical axis of rotation for themounting 60.

As is best shown in FIG. 9, seated in an upper end counterbore 72 of thethrough bore 68 and about the stud 70 is a stationary plastic bearingblock 74 which presents a conical seating surface 76 to a similarlyshaped conical surface 78 of a rotatable bearing member 80 also disposedabout the stud 70 and in practice seated in said bearing block. Byproviding the bearing members 74, 80 with confronting conical bearingsurfaces 76, 78,

and by additionally subjecting said members to the urgency of a spring82 disposed about the lower end of the stud 70, the rotatable bearingmember is automatically centered in the bearing block 74.

An additional function of the spring 82 is to hold the rotated positionprovided the rotatable bearing 80 resulting from selective adjustment ofthe orientation of the loudspeaker enclosure 14 during regulation of thedirectional sound radiation of the system. Thus, as best shown in FIG.9, the lower end of the spindle central through bore 68 is provided witha counterbore 84 accommodating the stud encircling spring '82, and suchspring is adapted to be compressed between spring seating washers 86 'byappropriate tightening up of the opposite end nuts 88 threadably engagedon opposite ends of the stud 70 to correspondingly urge the bearingsurfaces 76, 78 into a surface contact which holds the rotated positionof the bearing member 80. Also as best shown in FIG. 9, the electricalwiring retained by clips 90 along the boom channel 58 is convenientlyintroduced into each of the loudspeaker enclosures 14 through thecentral bore 92 of the stud 70.

Having particular reference now to the construction of each of theloudspeaker enclosures 14, such enclosure as best illustrated in FIGS. 8and 9 includes outer and inner support discs 94, 95 and a bottom shellhalf 96 interposed on the stud 70 between the bearing member 80 and thewasher 98 and upper end stud nut 88. Thus, the two support discs 94, 95and the bottom shell half 96 are urged by the spring 82 against therotatable bearing member 80 and accordingly rotate with said member. Tofurther insure rotation in unison of the enclosure 14 with the bearingmember 80, the enclosure parts 94-96 are physically connected to thebearing 80 by the bolt 100.

Referring now particularly to FIG. 8, cemented at an angle within thebottom shell half 96 is a mounting ring 102 accommodating a conicalspeaker 'bafile 104 connected by circumferentially spaced screws 106 tosaid ring 102 on a cushioning interposed gasket 108. A loudspeaker 110is angularly mounted as by bolts 112 in the opening 114 of said conicalspeaker baffle 104 and in accordance with well known speaker operationvibrates to produce sound in response to electrical impulses transmittedthrough the electrical wiring connected as at 116 to said speaker.Cemented or otherwise secured inwardly and about the opening 118 of thebottom shell half 96 is a connecting ring 120 which receives aperforated top shell half 122 to complete the construction of thespherical loudspeaker enclosure 14.

Another embodiment of a mounting for rotatably supporting a sphericalspeaker enclosure 14 is illustrated in FIGS. 10-13, the parts of suchembodiment which are identical in function to parts of the rotatablemounting 60 just described being designated with the same but primedreference numerals. Essentially mounting 60 differs from mounting 60 inthat provision is made for limiting rotation of the bearing member 80'to one 360 degree traverse in order to prevent undue twisting of theelectrical wiring 52 disposed through the hollow stud 70' of themounting. Accordingly, in mounting 60 use is made of a bearing ring 74'having a relatively large central opening 124 for seating the bearingmember 80 well within the spindle 62. Provided on the lower face 126 ofthe bearing member 80' is a stop pin 128 which extends into a circulargroove 130 machined in the bottom surface 132 of the spindle counterbore72' and which during rotation of the bearing member 80 engages amovement limiting stop pin 134 anchored in said circular groove 130 asis clearly shown in FIGS. 12 and 13. In all other major respects,however, mounting 60' is similar to previously described mounting 60.

Having reference to FIG. 10, the loudspeaker 110 is shown angularlymounted in another embodiment of a spherical loudspeaker enclosure 14'.This embodiment includes a bottom shell half 96' having a radial wall196 mounting a particular lip 138 which in the assembly of the enclosure14 accommodates the conical speaker baffle 104 in a sliding force fit.More particularly, the end of the speaker baffie 104' fitted on thebottom shell half 96 is provided with contiguous walls 140 and 142 ofvarying diameters, the larger diameter wall 140 being the one force fiton the circular lip 138 of the bottom shell half 96. Additionally,plural perforated top shell halves 144 and 146 are employed in thisspeaker enclosure embodiment, the perforations of which when mounted onthe bottom shell half 96 are out of alignment with each other to makethe interior of the enclosure 14 less accessible to the passage of dirtparticles and to outside probing.

In order of assembly, the wall 140 of the speaker bafile 104 is forcefit first about the lip extension 138 of the bottom shell half 96 andthe perforated inner top shell half 146 disposed over said baffie in aforce fit with the battle wall 140. The construction of the sphericalenclosure 14 is then completed by disposing the perforated outer topshell half 144 in a force fit over the bafile wall 142. Incorporated inthe construction of the loudspeaker enclosure 14 to promote richeracoustical characteristics in the reproduced sound is a relatively hardacoustical material 148 lining the inner surface of said enclosure andbacked with a lining of softer acoustical material 150.

From the foregoing description it will be appreciated that the commonsupport 10 of the present invention represents an optimum solution tothe vibration feed back problem usually encountered in the operation ofa high fidelity stereophonic system in that the various enclosures 12,14 (and 14') for the component parts of said system are mounted in arelatively compact spacial arrangement on said support, while thecomparatively longer path through which vibration can be transmittedbetween said enclosures is maintained at a length which for allpractical purposes results in substantial dampening out of saidvibration. Additionally, the loudspeaker enclosures 14, 14' aresupported on said common support 10 on rotatable mountings 60, 60 whichpermit selective adjustment of the directional sound radiation of thesystem.

A latitude of modification, change and substitution is intended in theforegoing disclosure and in some instances some features of theinvention will be employed without a corresponding use of otherfeatures. Accordingly, it is appropriate that the appended claims beconstrued broadly and in a manner consistent with the spirit and scopeof the invention herein.

What is claimed is:

1. A common support for a high fidelity stereophonic system including aturntable enclosure and a pair of loudspeaker enclosures, said supportcomprising an upstanding column, a laterally extending boom mounted atits medial portion on the upper end of said column, turntable enclosuremounting means slidably disposed on the upper end of said column againstsaid boom to secure said boom against lateral movement under the weightof the turntable of said system, and means on said boom for rotatablymounting each of said loudspeaker enclosures to permit selectiveadjustment in the directional sound radiation of the loudspeakers ofsaid system, said means being located on the opposite ends of said boomto isolate said loudspeakers from the turntable of the system to preventthe transmission of vibration therebetween.

2. A common support for a high fidelity stereophonic system including aturntable enclosure and a pair of loudspeaker enclosures, said supportcomprising a hollow upstanding column having opposite vertical slots inits upper end, a laterally extending boom mounted at its medial portionin said vertical slots, means mounting said turntable enclosure on theupper end of said column including a cylindrical collar slidablydis-posed in the end opening of said column and seating against saidboom for securing the same against lateral movement under the weight ofthe turntable of said system, and means on said boom for rotatablymounting each of said loudspeaker enclosures to permit selectiveadjustment in the direction- :11 sound radiation of the loudspeakers ofsaid system, said means being located on the opposite ends of said boomto isolate said loudspeakers from the turntable of the system to preventthe transmission of vibration therebetween.

3. A common support for a high fidelity stereophonic system including aturnable enclosure and a pair of loudspeaker enclosures, said supportcomprising a hollow upstanding column having opposite vertical slots inits upper end, a laterally extending boom mounted at its medial portionin said vertical slots and having spaced notches therein adapted toengage with the bottom edges of said slots for seating said boom on saidcolumn, turntable enclosure mounting means slidably disposed on theupper end of said column against said boom to secure said boom againstlateral movement under the weight of the turntable of said system, andmeans on said boom for rot-atably mounting each of said loud-speakerenclosures to permit selective adjustment in the directional soundradiation of the loudspeakers of said system, said means being locatedon the opposite ends of said boom to isolate said loudspeakers from theturntable of the system to prevent the transmission of vibrationtherebetween.

4. A common support for a high fidelity stereophonic system including aturntable enclosure and a pair of loudspeaker enclosures, said supportcomprising a hollow upstanding column having opposite vertical slots inits upper end, a laterally extending boom mounted at its medial portionin said vertical slots and having spaced notches therein adapted toengage with the bottom edges of said slots for seating said boom on saidcolumn, means mounting said turntable enclosure on the upper end of saidcolumn including a cylindrical collar slidably disposed in the endopening of said column and seating against said boom for securing thesame against lateral movement under the weight of the turntable of saidsys tem, and means on said boom for rotatably mounting each of saidloudspeaker enclosures to permit selective adjustment in the directionalsound radiation of the loudspeakers of said system, said means beinglocated on the opposite ends of said boom to isolate said loudspeakersfrom the turntable of the system to prevent the transmission ofvibration therebetween.

5. A common support for a high fidelity stereophonic system including aturntable enclosure and a pair of loudspeaker enclosures, said supportcomprising an upstanding column, a laterally extending boom mounted atits medial portion on the upper end of said column, turntable enclosuremounting means slidably disposed on the upper end of said column againstsaid boom to secure said boom against lateral movement under the weightof the turntable of said system, and a mounting for each loudspeakerenclosure carried by said boom including a bearing block fixedly mountedon said boom, a rotatable bearing seated on said bearing block andoperatively connected to each loudspeaker enclosure to permit selectiveadjustment in the directional sound radiation of the loudspeakers ofsaid system, and a threaded stud disposed vertically of said bearingblock and bearing and having end bolts threadably engaged thereon formaintaining said bearing in seated engagement with said bearing blockwhile permitting rotation thereof about the vertical axis of said stud,each of said loudspeaker mountings being located at each of the oppositeends of said boom to isolate said loudspeakers from the turntable of thesystem to prevent the transmission of vibration therebetween.

6. A common support for a high fidelity stereophonic system including aturntable enclosure and a pair of loudspeaker enclosures, said supportcomprising a hollow upstanding column having opposite vertical slots inits upper end, a laterally extending boom mounted at its medial portionin said vertical slots and having spaced notches therein adapted toengage with the bottom edges of said slots for seating said boom on saidcolumn, means mounting said turntable enclosure on the upper end of saidcolumn including a cylindrical collar slidably disposed in the endopening of said column and seating against said boom for securing thesame against lateral movement under the weight of the turntable of saidsystem, and a mounting for each loudspeaker enclosure carried by saidboom including a bearing block fixedly mounted on said boom, a rotatablebearing seated on said bearing block and operatively connected to eachloudspeaker enclosure to permit selective adjustment in the directionalsound radiation of the loudspeakers of said system, and a threaded studdisposed vertically of said bearing block and bearing and having endbolts threadably engaged thereon for maintaining said bearing in seatedengagement with said bearing block While permitting rotation thereofabout the vertical axis of said stud, each of said loudspeaker mountingsbeing located at each of the opposite ends of said boom to isolate saidloudspeakers from the turntable of the system to prevent thetransmission of vibration therebetween.

7. A common support for a high fidelity stereophonic system including aturntable enclosure and a pair of loudspeaker enclosures, said supportcomprising an upstanding column, a laterally extending boom mounted atits medial portion on the upper end of said column, turntable enclosuremounting means slidably disposed on the upper end of said column againstsaid boom to secure said boom against lateral movement under the weightof the turntable of said system, a mounting for each of said loudspeakerenclosures carried on each of the opposite ends of said boom including aspindle having a vertical through bore, a bearing block having a centralopening disposed in an end counterbore of said spindle through bore, arotatable bearing seated on said bearing block and having stop means onits seating surface extending through the central opening of saidbearing block and adapted to engage with cooperating stop means on saidspindle for limiting rotation of said bearing while seated on saidbearing block to approximately one 360 degree traverse, and a hollowthreaded stud disposed vertically of said bearing and bearing blockwithin said spindle through bore and having end nuts thereon formaintaining said bearing in seated engagement on said bearing block,means connecting each loudspeaker enclosure to each bearing to permitselective adjustment in the directional sound radiation of theloudspeakers of said system, and at least two electrical wires connectedbetween said turntable and loudspeaker enclosures including meansmounting said electrical wires along the underside of said boom, themedial portion of said boom and said means mounting said turntableenclosure having aligned openings therein for threading one end of bothsaid wires into said turntable enclosure and the other end of each saidwire being threaded through each hollow stud into each loudspeakerenclosure.

8. A high fidelity stereophonic system comprising a support including anupstanding column having an upper end, a turntable enclosure disposedsymmetrically of said support and mounted on the upper end of saidcolumn, first and second loudspeaker mounting arms extendinglongitudinally in opposite direction beneath said turntable enclosureand terminating in first and second mounting ends equally spaced beyondthe opposite ends of said turntable enclosure, a first loudspeakerenclosure journalled on said first mounting end of said first mountingarm for rotation about a first vertical polar axis, a second loudspeakerenclosure journalled on said second mounting end of said second mountingarm for rotation about a second vertical polar axis, and a first and asecond loudspeaker mounted respectively in said first and secondloudspeaker enclosures, each of said first and second loudspeakers beingmounted with the axis thereof at an acute angle to the horizontal, saidloudspeaker enclosures being adjustably relative to each other and tosaid turntable enclosure in accordance with the acousticalcharacteristic of the environment for said system.

9. A high fidelity stereop-honic system comprising a support includingan upstanding column having an upper end, a turntable enclosure disposedsymmetrically of said support and mounted on the upper end of saidcolumn, first and second loudspeaker mounting arms extendinglongitudinally in opposite directions beneath said turntable enclosureand terminating in first and second mounting ends equally spaced beyondthe opposite ends of said turntable enclosure, 21 first sphericalloudspeaker enclosure journalled on said first mounting end of saidfirst mounting arm for rotation about a first vertical polar axis, asecond spherical loudspeaker enclosure journalled on said secondmounting end of said second mounting arm for rotation about a secondvertical polar axis, first and second loudspeakers, and mounting meanswithin each of said loudspeaker enclosures for mounting said first andsecond loudspeakers respectively in said first and second loudspeakerenclosures, each of said first and second loudspeakers being mountedWith the axis thereof at an acute angle to the horizontal, saidloudspeaker enclosures being, adjustably relative to each other and tosaid turntable enclosure in accordance with the acousticalcharacteristic of the environment for said system.

10. A loudspeaker construction for a high fidelity stereophonic systemcomprising a loudspeaker enclosure, a support, means mounting saidloudspeaker enclosure for rotation on said support, a loudspeaker, andmeans mounting said loudspeaker within said loudspeaker enclosure Withthe axis of said loudspeaker at an angle to the axis of rotation of saidloudspeaker enclosure.

11. A loudspeaker construction for a high fidelity stereophonic systemcomprising a loudspeaker enclosure, 21 support, mounting means includinga member disposed substantially vertically on said support and meansmounting said loudspeaker enclosure on said member for rotation aboutthe vertical axis of said member, a loudspeaker, and means mounting saidloudspeaker within said loudspeaker enclosure with the axis of saidloudspeaker at an angle to said vertical axis of said member.

No references cited.

WILLIAM C. COOPER, Primary Examiner.

